Bonsai Forum

TOPIC: Choosing bonsai pot

Hello, I am new to bonsai, it was always a dream for me to have them but I was always scared of getting one, I got one 16 months ago and I was wondering what are the pots requisites for bonsai.
Like, what are the materials? would plastic pot work? things like that, also size and height.
I really want to learn as much as I can.
I've seen bonsai that didn't even have pots, like this:
goo.gl/x797mL
So is there any restriction to which pot I should get?